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Published in: Digestive Diseases and Sciences 11/2007

01-11-2007 | Original Paper

Clostridium butyricum TO-A Culture Supernatant Downregulates TLR4 in Human Colonic Epithelial Cells

Authors: Atsushi Isono, Tatsuro Katsuno, Toru Sato, Tomoo Nakagawa, Yasutaka Kato, Naoki Sato, Gen’ichiro Seo, Yasuo Suzuki, Yasushi Saito

Published in: Digestive Diseases and Sciences | Issue 11/2007

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Abstract

The present study was performed to examine whether probiotics affect Toll-like receptor 4 (TLR4) expression in human colonic epithelial cells. Culture supernatants or heat-killed bacteria of Bacillus mesentericus TO-A, Clostridium butyricum TO-A, and Streptococcus faecalis T-110 were applied to human colonic epithelial cells. Treatment with C. butyricum TO-A culture supernatant significantly reduced TLR4 mRNA level (×0.16), even in the presence of interferon-γ (IFN-γ; ×0.21) as compared with untreated controls. High-performance liquid chromatography analysis showed that C. butyricum TO-A supernatant contains formate, acetate, and butyrate. Interestingly, TLR4 mRNA was significantly suppressed (×0.15–×0.22) only when cells were treated with solutions containing butyrate. Electrophoretic mobility shift assay suggested that the binding affinity of PU.1 to the promoter region of the TLR4 gene was markedly inhibited when the cells were treated with butyrate. This study suggested that butyrate produced by C. butyricum TO-A downregulates TLR4 mRNA level in human colonic epithelial cells.
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Metadata
Title
Clostridium butyricum TO-A Culture Supernatant Downregulates TLR4 in Human Colonic Epithelial Cells
Authors
Atsushi Isono
Tatsuro Katsuno
Toru Sato
Tomoo Nakagawa
Yasutaka Kato
Naoki Sato
Gen’ichiro Seo
Yasuo Suzuki
Yasushi Saito
Publication date
01-11-2007
Publisher
Springer US
Published in
Digestive Diseases and Sciences / Issue 11/2007
Print ISSN: 0163-2116
Electronic ISSN: 1573-2568
DOI
https://doi.org/10.1007/s10620-006-9593-3

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